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Spectrally resolved fully phase‐encoded three‐dimensional fast spin‐echo imaging
Author(s) -
Artz Nathan S.,
Hernando Diego,
Taviani Valentina,
Samsonov Alexey,
Brittain Jean H.,
Reeder Scott B.
Publication year - 2014
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24704
Subject(s) - imaging phantom , phase (matter) , distortion (music) , materials science , nuclear magnetic resonance , chemical species , physics , optics , optoelectronics , amplifier , cmos , quantum mechanics
Purpose To develop and test the feasibility of a spectrally resolved fully phase‐encoded (SR‐FPE) three‐dimensional fast spin‐echo technique and to demonstrate its application for distortion‐free imaging near metal and chemical species separation. Methods In separate scans at 1.5 T, a hip prosthesis phantom and a sphere filled with gadolinium solution were imaged with SR‐FPE and compared to conventional three‐dimensional‐fast spin‐echo. Spectral modeling was performed on the SR‐FPE data to generate the following parametric maps: species‐specific signal ( ρ species ), B 0 field inhomogeneity, and R* 2 . The prosthesis phantom was also scanned using a 16‐channel coil at 1.5 T. The fully sampled k‐space data were retrospectively undersampled to demonstrate the feasibility of parallel imaging acceleration in all three phase‐encoding directions, in combination with corner‐cutting and half‐Fourier sampling. Finally, SR‐FPE was performed with an acetone/water/oil phantom to test chemical species separation. Results High quality distortion‐free images and parametric maps were generated from SR‐FPE. A 4 h SR‐FPE scan was retrospectively accelerated to 12 min while preserving spectral information and 7.5 min without preserving spectral data. Chemical species separation was demonstrated in the acetone/water/oil phantom. Conclusion This work demonstrates the feasibility of SR‐FPE to perform chemical species separation and spectrally resolved imaging near metal without distortion, in scan times appropriate for the clinical setting. Magn Reson Med 71:681–690, 2014. © 2013 Wiley Periodicals, Inc.